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A thin convex lens forms real image of an object on a screen. If you add another thin lens, in contact with the convex lens, it is now observed that a real image is formed at a longer distance. Which of the following statements is correct?

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The new lens added is a convex lens with a longer focal length than the first lens.

The new lens added is a concave lens with a shorter focal length than the first lens.

The new lens added is a concave lens with a longer focal length than the first lens.

The new lens added is a convex lens with a shorter focal length than the first lens.

answer is D.

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Detailed Solution

Power is additive. If image is now at longer distance, power is reduced.
Hence, must be concave lens but with larger focal distance, so as to form real image.

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